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Title: Insight into the mechanism and outcoupling enhancement of excimer-associated white light generation
Authors: Ying-Hsiao Chen;Kuo-Chun Tang;Yi-Ting Chen;Jiun-Yi Shen;Yu-Sin Wu;Shih-Hung Liu;Chun-Shu Lee;Chang-Hsuan Chen;Tzu-Yu Lai;Shih-Huang Tung;Ru-Jong Jeng;Wen-Yi Hung;Min Jiao;Chung-Chih Wud;Pi-Tai Chou
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2016
Issue Date: 2017-02-13T03:15:25Z
Publisher: Chemical Science
Abstract: Abstract: Fundamental insight into excimer formation has been gained by using 9,10-bis[4-(9-carbazolyl)phenyl]anthracene] (Cz9PhAn) as a probe. Cz9PhAn exhibits a highly emissive blue fluorescence in solution and is found to emit a panchromatic white light spectrum (400–750 nm) in film, powder and single crystal, in which an additional excimer band appears at ∼550 nm. Detailed structural analyses, emission relaxation dynamics and a theoretical approach conclude the formation of an anthracene*/phenyl ring excimer through an overlap between π* (anthracene) and π (phenyl ring) orbitals in a face-to-edge stacking orientation. The rate of excimer formation is determined to be 2.2 × 109 s−1 at room temperature, which requires coupling with lattice motion with an activation energy of 0.44 kcal mol−1. Exploiting Cz9PhAn as a single emitter, a fluorescent white organic light emitting diode (WOLED) is fabricated with a maximum external quantum efficiency (ηext) of 3.6% at 1000 cd m−2 (4.2 V) and Commission Internationale de L'Eclairage (CIE) coordinates of (0.30, 0.33). The white-light Cz9PhAn reveals a preferred orientation of the transition dipole moment in the emitting layer to enhance light outcoupling. This non-doped, single component (Cz9PhAn) WOLED greatly reduces the complexity of the fabrication process, rendering a green and cost-effective alternative among the contemporary display/lighting technologies.
Relation: 6
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41260
Appears in Collections:[光電科學研究所] 期刊論文

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